Question

inference lime water test
for starch​

Answer 1

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Materials

Container with lid (a plastic food container would work fine)

Distilled water

Tap water

Calcium oxide (lime)

Teaspoon

Spoon

¼ cup measuring cup

White vinegar

Small shallow dish (a baby food jar or a salad dressing cup work great)

2 clear water bottles

Modeling clay

2 bendy straws

Scissors

Ruler

Toilet paper

Baking soda

Procedure

Take the container with a lid and add 1L of distilled water and 1 teaspoon of calcium oxide. Stir with the spoon.

Let the solution sit overnight. This will be your limewater. Why do we refer to it as limewater?

Fill the small, shallow dish with limewater.

Take modeling clay and mold it into a ring just below the bendable part of your straw.

Add ¼ cup of water and ¼ cup of white vinegar into the water bottle.

Take 1 square of toilet paper and spread some baking soda in the middle of the paper. Roll it up and twist the ends of the toilet paper so the baking soda does not spill out.

Drop of the baking soda in the toilet paper into the water bottle.

Immediately insert the end of the straw into the water bottle, making sure that it is submerged in the liquid. Use the modeling clay to seal the straw into the neck of water bottle.

Bend the end of the straw and submerge it in your container of limewater.

Observe what happens. Record your observations.

Add ¼-cup of limewater to another clear water bottle.

Make a second modeling clay plug around your second bendy straw and insert the straw and plug into the water bottle.

Take a deep breath and exhale into the straw so your breath goes into the limewater. Be careful not to suck any lime water up!

Record your observations.

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